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Wyświetlanie 1-10 z 61
Tytuł:
The distribution of different virulence grass carp reovirus strains in some neglected tissues
Autorzy:
Liang, H.R.
Fu, X.Z.
Li, N.Q.
Liu, L.H.
Lin, Q.
Li, Y.G.
Peng, Y.A.
Huang, Z.B.
Wu, S.Q.
Powiązania:
https://bibliotekanauki.pl/articles/30668.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon-based acid catalyst from waste seed shells: preparation and characterization
Autorzy:
Wang, L. H.
Liu, H.
Li, L.
Powiązania:
https://bibliotekanauki.pl/articles/778575.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
carbon-based solid acid
waste seed shells
esterification
transesterification
biodiesel
Opis:
A carbon-based solid acid catalyst was prepared by the sulfonation of carbonized seed shells of Jatropha curcas (J. curcas L.). The structure of amorphous carbon consisting of polycyclic aromatic carbon sheets attached a high density of acidic SO3H groups (2.0 mmol · g−1) was identified with scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The performance of the solid acid catalyst was evaluated for biodiesel production in the esterification of oleic acid with methanol. 95.7% yield of biodiesel was obtained after 2 h reaction and the conversions with reused catalyst varied in the range of 95.7% to 95.1%, showing better activity and stability than commercial catalyst amberlyst-46. It was also observed that the prepared catalyst showed enhanced activity in the transesterification of triolein with methanol when compared with other solid acid catalysts. A synergistic effect results from the high density of SO3H groups and the good access of reactants to the acidic sites can be used to explain the excellent catalytic activity, as well as the strong affinity between the hydrophilic reactants and the neutral OH groups bonded to the polycyclic aromatic carbon rings.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 4; 37-41
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of compressive failure of concrete under static and dynamic loads
Autorzy:
Liu, L.
An, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/230225.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
beton
wytrzymałość na ściskanie jednoosiowe
dynamiczne ładowanie
szybkość odkształcania
pęknięcie
fragmentacja
concrete
uniaxial compressive strength
dynamic load
strain rate
fracture
fragmentation
Opis:
The fracture and fragmentation of concrete under static and dynamic loads are studied. The uniaxial compressive strength test is employed to study the concrete behavior under static loads while the split Hopkinson pressure bar is used to study the dynamic behavior of the concrete under static loads. The theories for acquiring the stress, strain and strain rate of the concrete in the dynamic test by Hopkinson pressure bar has been introduced. The fracture patterns of the concrete in the uniaxial compressive test have been obtained and the static concrete compressive strengths have been calculated. The fracture patterns of the concrete in the uniaxial compressive test have been obtained and the static concrete compressive strengths have been calculated. The fracture and fragmentation of the specimen under dynamic loads have been acquired and the stress-strain curves of concrete under various impact loads are obtained. The stress-strain curve indicates a typical brittle material failure process which includes existing micro-fracture closure stage, linear-elastic stage, nonlinear-elastic stage, and post-failure stages. The influence of the loading rate for the compressive strength of the concrete has compared. Compared with the concrete under static loads, the dynamic loads can produce more fractures and fragments. The concrete strength is influenced by the strain rate and the strength increases almost linearly with the increase of the strain rate.
Źródło:
Archives of Civil Engineering; 2020, 66, 3; 427-441
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of dynamic behaviors of concrete under various strain rates
Autorzy:
An, H. M.
Liu, L.
Powiązania:
https://bibliotekanauki.pl/articles/230844.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zachowanie dynamiczne
beton
model Holmquist-Johnson-Cook
HJC
pasek ciśnienia Hopkinsona rozdzielony
SHPB
pęknięcie
podział
dynamic behavior
concrete
Holmquist-Johnson-Cook model
split Hopkinson pressure bar
fracture
fragmentation
Opis:
As the dynamic behavior of the concrete is different from that under static load, this research focuses on the study of dynamic responses of concrete by simulating the split Hopkinson pressure bar (SHPB) test. Finite element code LS-DYNA is used for modeling the dynamic behaviors of concrete. Three continuous models are reviewed and the Holmquist-Johnson-Cook model (HJC) is introduced in detail. The HJC model which has been implemented in LS-DYNA is used to represent the concrete properties. The SHPB test model is established and a few stress waves are applied to the incident bar to simulate the dynamic concrete behaviors. The stress-strain curves are obtained. The stress distributions are analyzed. The crack initiation and propagation process are described. It is concluded that: the HJC model can modeling the entire process of the fracture initiation and fragmentation; the compressive of the concrete is significantly influenced by the strain rates.
Źródło:
Archives of Civil Engineering; 2019, 65, 4; 21-36
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear PTO effect on performance of vertical axisymmetric wave energy converter using semi-analytical method
Autorzy:
Liu, M.
Liu, H.
Zheng, X.
Chen, H.
Wang, L.
Zhang, L.
Powiązania:
https://bibliotekanauki.pl/articles/258878.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
wave energy converter (WEC)
power take-off (PTO)
capture width ratios
analytical method
eigen function
Opis:
The wave energy, as a clean and non-pollution renewable energy sources, has become a hot research topic at home and abroad and is likely to become a new industry in the future. In this article, to effectively extract and maximize the energy from ocean waves, a vertical axisymmetric wave energy converter (WEC) was presented according to investigating of the advantages and disadvantages of the current WEC. The linear and quadratic equations in frequency-domain for the reactive controlled single-point converter property under regular waves condition are proposed for an efficient power take-off (PTO). A method of damping coefficients, theoretical added mass and exciting force are calculated with the analytical method which is in use of the series expansion of eigen functions. The loads of optimal reactive and resistive, the amplitudes of corresponding oscillation, and the width ratios of energy capture are determined approximately and discussed in numerical results.
Źródło:
Polish Maritime Research; 2017, S 3; 49-57
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of objective functions of optimization-based smoothing algorithm for tetrahedral mesh improvement
Autorzy:
Dai, C.
Liu, H.-L.
Dong, L.
Powiązania:
https://bibliotekanauki.pl/articles/279637.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
objective function
mesh quality metric
optimization-based smoothing
mesh quality improvement
mesh generation
Opis:
The objective function based on mesh quality metric has a major impact on smoothing unstructured tetrahedral meshes. The ability of seven mesh quality metrics to distinguish four kinds of poor-quality elements and their effects on the change of element shape are analyzed in detail. Then, four better mesh quality metrics are chosen to construct objective functions. In addition, the rational determination of searching direction and the optimal step size in the optimization algorithm of solving the objective function are proposed. Finally, comparisons with the other three objective functions are made according to different number of elements, iteration limit, and the desired accuracy in the improved mesh. It is found that with the increase of the number of elements, the time consumed during optimization increases, but the changes of the worst quality element are different. The number of iterations has little effect on the mesh quality and the time cost. The increasing of the desired degree of accuracy will improve the mesh quality and cost more time. Furthermore, the approach using objective function is compared with Freitag’s common approach. It is clearly shown that it performs better than the existing approach.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 151-163
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Building the B2B customer loyalty : a role of relationship quality
Budowanie lojalności klienta B2B : rola jakości relacji
Autorzy:
Liu, L.-W.
Yang, W.-G.
Liu, W.-H.
Powiązania:
https://bibliotekanauki.pl/articles/405772.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska
Tematy:
information sharing
customer orientation
B2B relationship
PLS-SEM
relationship marketing
wymiana informacji
orientacja na klienta
relacje B2B
marketing relacji
Opis:
The purpose of this study was to investigate the E-Commerce relationship quality and loyalty in B2B supplier and client’s relationships. This study tries to conceptualize a model based on the relationship quality that is applied to understand loyalty in B2B environment. The subjects of this study, from whom 81 valid questionnaires were collected, were the clients of the supplier’s ERP system in the Taiwan. When descriptive statistics and partial least squares (PLS) were adopted to analyse the collected valid data, we obtained the following findings. Relationship quality was perceived through the behavior of both supplier and clients and the quality of their interaction. Relationship quality antecedents include the information sharing and customer orientation. The finding suggests that supplier with strong levels of customer orientation, the supplier and clients were built a stronger relationship and high loyalty. Surprisingly, information sharing shown no significant effects on the relationship quality. This study implies that using information sharing and customer orientation strengthen their relationship quality, thereby enhancing loyalty. The finding of this study implies that it is important for a B2B supplier management to understand clients’ needs and responses. B2B suppliers can learn from this study, that customer orientation, relationship quality, commitment, have a positive impact on loyalty in both direct and indirect ways.
Celem artykułu była analiza jakości relacji z klientami i lojalności w handlu elektronicznym u dostawcy B2B. Niniejsze badanie jest próbą konceptualizacji modelu opartego na jakości relacji, który jest próbą zrozumienia lojalności w środowisku B2B. Przedmiotem badania byli wybrani klienci systemu ERP w oparciu na zebranych 81 kwestionariuszach firm na Tajwanie. Przyjęto statystyki opisowe i w oparciu o metodę najmniejszych kwadratów (PLS) w celu przeanalizowania zebranych istotnych danych. Jakość relacji postrzegano poprzez zachowanie zarówno dostawcy, jak i klientów oraz jakość ich interakcji. Jakość relacji przede wszystkim obejmuje dzielenie się informacjami i orientację na klienta. Wyniki sugerują, że dostawcy z silnym poziomem orientacji na klienta, zbudowali silniejszą więź i wysoką lojalność relacji z dostawcami i klientami. Co zaskakujące, wymiana informacji nie wykazała znaczącego wpływu na jakość relacji. Badanie zakłada, że korzystanie z wymiany informacji i orientacja na klienta wzmacnia ich jakość relacji, zwiększając przez to lojalność. Odkrycie tego badania implikuje, że dla dostawcy usług B2B ważne jest zrozumienie potrzeb i odpowiedzi klientów. Dostawcy B2B winni zauważyć, że orientacja na klienta, jakość relacji, zaangażowanie, mają pozytywny wpływ na lojalność zarówno w sposób bezpośredni, jak i pośredni.
Źródło:
Polish Journal of Management Studies; 2017, 16, 1; 105-114
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application the optimization models to analysis of the industrial pollutant emission in China
Autorzy:
Zhang, Z.
Liu, G.-D.
Guo, H.
Liu, L.
Deng, S.-H.
Powiązania:
https://bibliotekanauki.pl/articles/950041.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
industrial emissions
air pollution
mathematical models
sulfur dioxide
air pollutant emission
environmental indicators
industrial pollutants
smoke emission
emisja przemysłowa
zanieczyszczenie powietrza
model matematyczny
dwutlenek siarki
ditlenek siarki
emisja zanieczyszczeń powietrza
wskaźniki środowiskowe
zanieczyszczenia przemysłowe
emisja dymu
Opis:
An industrial planning is made based on the optimization model. Factor analysis was used to reject relativity among the environmental indicators. Then, thirty nine industries were clustered into four clusters. Lastly, optimization model was used to plan the industrial structure. Adjusting the industrial structure, it is difficult to reduce vast SO2, smoke, and dust with total industrial output value growth; the air pollutant emission only can be decreased by 10%. The parameters of smoke emission are limited constrains for the optimization. The reasonable and feasible way to solve the problem is to introduce the lower smoke emission technique of the cluster 2 and 4 industries.
Źródło:
Environment Protection Engineering; 2013, 39, 1; 87-99
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new needle stonefly with parasitic mites from the Eocene Baltic amber
Autorzy:
Chen, Z.-T.
Liu, H.-L.
Powiązania:
https://bibliotekanauki.pl/articles/31341385.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
Insecta
Baltileuctra dewalti
new species
needle stonefly
morphology
Leuctridae
Plecoptera
parasitic mite
Eocene
Baltic amber
Źródło:
Acta Palaeontologica Polonica; 2022, 67, 3; 649-654
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors Affecting the Measurement of the Percentage of Gaseous Products from Boron-based Fuel-rich Propellants
Autorzy:
Liu, L.-L.
He, G.-Q.
Wang, Y.-H.
Liu, P.-J.
Powiązania:
https://bibliotekanauki.pl/articles/358720.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
fuel-rich propellant
percentage gaseous products
combustion
filter media
Opis:
Acid-washed asbestos, carbon fibre, and MgO with carbon fibre were used as the filter media in order to compare their filtering qualities in the estimation of the percentage of gaseous products (PGP) arising from the combustion of singlebase propellants, double-base propellants, and boron-based fuel-rich propellants. The comparison was based on an analysis of the experimentally registered influence of the propellant formulation, the propellant load, the maximum chamber pressure and the thickness of the MgO filter layer on the PGP from the fuel-rich propellant, and in particular on the PGP produced by combustion of boron-based fuel-rich propellant. The results showed that the experimental values of the PGP were closer to the theoretically predicted values when carbon fibre mixed with MgO powder was used as the filter medium. The PGP of boron-based fuel-rich propellant increased when the AP was in part replaced by HMX, when the AP content was increased and when boron was in part replaced by magnesium-aluminum alloy. In terms of the apparatus used in these experiments, the propellant loading density was found to have little correspondence with the PGP for boron-based fuel-rich propellant. The optimal propellant loading density for the chamber volume of 85 cm3 was found to be 2-2.5 g, in view of the reliability and safety of the experiment. It is emphasised that the thickness of the MgO filter layer is very important for the accuracy and reliability of the experiment, and that the optimum should be determined by experiment.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 1; 15-29
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 61

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